Urban Mammoth have extended their free international shipping offer to December 31st.
From their announcement:

Due to the continuing terrible weather in Scotland our factory is still snowed in and as a consequence mail orders have been delayed, however things are starting to move. As orders have been delayed we are going to extend our international free shipping offer until the 31st of December.
If you have already ordered please do not worry, the Royal Mail are delivering now so your orders will be with you soon.
Finally we’d like to wish all our customers the very best over the holiday period and a fantastic New Year; see you on the other side.